【摘要】 通过刚性模型测压风洞试验，研究了一系列邻边夹角不同的菱形截面高层建筑立面上测点风压的体型系数和以平均基底弯矩系数为计算目标的整体风荷载体型系数的变化特征，并与他人研究成果进行了比较，系统地研究了邻边夹角变化对两个体型系数的影响。试验结果表明，随着迎风一侧两邻边夹角的增大，测点体型系数在迎风面上呈增大的趋势，在背风面上则呈略微减小(绝对值增大)的趋势；当风荷载分解到菱形两对角线方向时，建筑两邻边夹角对建筑整体风荷载体型系数影响很大，近似呈线性关系；当风荷载分解到建筑一立面的法向和切向两方向时，法向风荷载分量的体型系数在1.3左右，对菱形邻边夹角的变化不敏感，切向风荷载分量的体型系数在1.1～1.3之间，随菱形邻边夹角的增大呈下降趋势。最后给出了以上两种风荷载分解方案下建筑整体风荷载体型系数随菱形邻边夹角变化的拟合公式。更多还原

【Abstract】 Through the wind tunnel test of rigid model pressure measurement, the variation characteristics of the shape coefficient of wind pressure and the overall wind load shape coefficient with the average base bending moment coefficient as the calculation target on a series of rhombus section high-rise building facades with different adjacent side angles were studied, and compared with the research results of others, the influence of the change of adjacent side angle on the two shape coefficients was systematically studied. The test results show that with the increase of the angle between the two adjacent sides on the windward side, the shape coefficient of the measuring point increases on the windward side, and decreases slightly on the leeward side(the absolute value increases). When the wind load is decomposed into two diagonal directions of the rhombus, the angle between the two adjacent sides of the building has a great influence on the overall wind load shape coefficient of the building, which is approximately linear. When the wind load is decomposed into the normal and tangential directions of a building facade, the shape coefficient of the normal wind load component is about 1.3, which is not sensitive to the change of the angle between the rhombus adjacent sides. The shape coefficient of the tangential wind load component is between 1.1 and 1.3, which decreases with the increase of the angle between the rhombus adjacent sides. Finally, the fitting formula of the shape coefficient of the overall wind load of the building with the change of the angle between the rhombus adjacent sides under the above two wind load decomposition schemes was given.更多还原